Hi everyone, would anybody be able to tell me the product no. for the top left hose going from rad to water pump, (p38 2.5 bmw 1998)

Thanks

Try Island 4x4 part number PCH116950 £5.19 inc vat with out an EGR Valve or PCH 124730 £7.49 if you have an EGR valve (Top Hoses)
Assuming you mean the left as you look at it from the drivers seat
Other wise its part number PCH124720 £6.49 inc vat (bottom Hose) which is the one viewed from the left as you look into the engine bay from the front of the car.